Range-finder.



I A. C. TUBBS. RANGE FINDER APPLICATION FILED 8.14. 1917- Patented Dec. 18, 1917'.

l/Vl/E/VTOI? H4405 C 70555,

AITOR/VEVS STATES PATENT- onnron.

AMOS e. TUIBBS, or 'mnnmeros'r, muses.

To all whom it may concern:

Be it known that I, AMOS O. Tones, a citizen of the United States, and a resident of Tradingpost, in the State of Kansas, have invented a certain new and useful Improvement in Range-Finders, of which the folherein described and claimed.

. focusing means.

means comprises a thumb screw which may be turned-to move an inner tube forwardly An object of my invention is to provide a simpledevice, which may -be used with any ordinary telescope, field glass, or other device having means for focusing the same.

An object of my invention is to provide a focusing device which is simple in construction, has few parts andv which is therefore not easily liable to get out of order, and which will give the range accurate y for any distance to which the telescope can be clearly focused.

A further object of my invention is to provide 'arange finder operated by the necessary focusing of the device, and which, when the device is in focus, will give the range on a dial carried by the device.

Other objects and advantages will appear in the following specification, and the novel features of the invention will be particularly pointed out in the appended claims.

My invention is illustrated in the accompanying drawing forming a part-of this application, and in which:v

Figure 1 is aplan view of the device;

Fig. 2 is a bottom plan view of a. portion of the device;

Fig. 3 is a section along the line 33 of Fig.1; I i

Fig. 4 is 3. pers ective view of a pointer and means for ac uating the same, and Fig. 5is a section along the line 5-+5 of Fig. 2.

I In carrying out my invention, I make use of atelescope of any suitable type having Ordinarilythe focusing or backwardly, so as to bring the object in proper focus.

The range finder is shown applied to a telescope; dpsisting of the relativelyfixed main bodyjam a focusing tube or slide, the device-being adapted more particularly to,

RANGE-FINDER.

I Specification of Letters Patent.

Patented Dec.18, 1917.

. Application filed February 14, 1917. Serial 1%. 148,520.

member.

Referring then to Fig. 1, the main body portion of the telescope is shown at 1.- This such a telescope having simply one slidable 'isprovided-with an extension or focusing tube 2, at one end. The body portion 1 is carried bythe extension 2 registers.

brackets 5 in which is pivotally mounted-the shaft 6 of a thumb wheel 7. The thumb wheel is provided with a pinion 8 which 'engages the rack 4. so that when the thumb wheel 7 is turned the extension 2 will be moved into or out of the end of the body portion 1. Q

The extension 2 carries a pin 9 which enters between two arms 10 carried-by a disk 11, see Fig. 4. Secured to the disk is a pointer 12 having a pivoted portion 13. Extending from the body portion 1 and preferably integral therewith, are ears 14 between 1 which is secured a dial plate 15, by means of a set screw 16, see Fig. 5. The pivoted is calibrated so as to give the distance reading directly when the object is brought into focus. All that is necessary is to sight the telescope on the object, bring it into focus, and read the range directly on the scale.

In focusing the telescope, the section 2 is -moved out a distance in inverse proportion to the distance of the object to' be sighted. For this reason the graduations 17 on the dial plate 15 are arranged progressively nearer each other, as the distances which they represent, increase. For instance, in

provided with a slot 3, see Fig. 2, preferably on the under side with which a rack 4 A sighting an object two miles away, the section '2' is drawn out until the pointer 12 points to 2, when the .telescopeshould be in focus for objects at thisdistance. If the next ob eet be three miles away, the section points to 3. But the distance between 2 and 3 on the dial is less than the distance between l'and 2, since as stated above, the farther the object is away, the less the section 2 need be drawn out to bring the object into focus.

p The eyes of'diiferent people differ, so that it may be necessary to adjust the dial for any particular observer. This may be done by unloosening the set screw 16, moving the dialto the proper position, and then tightening the set screw again. 7

While the construction and arrangement of the device as illustrated in the accompanying drawing is that of a generally preferred form, obviously modifications and changes may be made without departing from the spirit of the invention or the scope of the claims.-

I claim:

1. In a range finder for a telescope including a body portion and a sliding extension, a dial carried by the body portion, a pointer playing over the dial having connection with and actuated by the movement of the sliding extension, and means for adjusting the'dial with respect to the pointer to compensate for differences in eyesight of observers.

2. In a range finder for telescopes, a dial secured to the body portion of the telescope, a pointer pivotally mounted to play over the dial, a bifurcated arm carried by the pointer, means carried by the focusing tube of the telescope movable in the bifurcated arm for magma moving the latter, and means for moving said focusing tube and simultaneously shifting the pointer.

'3. In a range finder for a telescope, including a body portion having bearing members and a sliding extension, a dial supported between'the bearing members, a pointer playing over the dial and having a pivot portion revoluble in the bearing members, and an arm partly encircling the telescope, rack and pinion devices for moving the sliding extension with respect to the body portion, and a free connection between said extension and the pointer arm for revolving the pivot portion as said extension is moved.

4. A focusing device for telescopes comprising a dial secured to the body portion of the telescope, a pointer pivotally mounted to play over the said dial, a pair of arms secured to the pivot of the pointer, a pin carried by the focusingtube and disposed between said arms, the body portion of the telescope having a slot, a rack portion carried by the focusing tube in register with the slot, bearings carried by the body portion of the telescope, a shaft rotatably mounted in said bearings, a thumb wheel at one end of said shaft, and a pinion carried by the shaft and arranged to engage the rack.

Amos 0. TUBES.

Witnesses W. H. NIPHON, E. L. Tomas.

Games ot this patent may he obtained. tor five cents each, by addressing the "Commissioner of illatento, Washington, a. Q. 

